From 34818d50e7f7d3f31391ab31324939dcd381fbcd Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 14 Oct 2025 19:15:20 +0200
Subject: [SERVER] iscsi refactor: First working version

---
 src/server/net.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/server/net.c')

diff --git a/src/server/net.c b/src/server/net.c
index 41caa96..fcbe9fb 100644
--- a/src/server/net.c
+++ b/src/server/net.c
@@ -33,6 +33,7 @@
 #include <dnbd3/shared/serialize.h>
 
 #include <assert.h>
+#include <netinet/tcp.h>
 
 #ifdef __linux__
 #include <sys/sendfile.h>
@@ -174,6 +175,21 @@ void* net_handleNewConnection(void *clientPtr)
 
 	// Await data from client. Since this is a fresh connection, we expect data right away
 	sock_setTimeout( client->sock, _clientTimeout );
+	// NODELAY makes sense since we're sending a lot of data
+	int e2 = 1;
+	socklen_t optlen = sizeof(e2);
+	setsockopt( client->sock, IPPROTO_TCP, TCP_NODELAY, (void *)&e2, optlen );
+	// Also increase send buffer
+	if ( getsockopt( client->sock, SOL_SOCKET, SO_SNDBUF, (void *)&e2, &optlen ) == 0 ) {
+#ifdef __linux__
+		// Linux doubles the value to account for overhead, get "real" value
+		e2 /= 2;
+#endif
+		if ( e2 < SERVER_TCP_BUFFER_MIN_SIZE_PAYLOAD ) {
+			e2 = SERVER_TCP_BUFFER_MIN_SIZE_PAYLOAD;
+			setsockopt( client->sock, SOL_SOCKET, SO_SNDBUF, &e2, sizeof(e2) );
+		}
+	}
 	do {
 #ifdef DNBD3_SERVER_AFL
 		const int ret = (int)recv( 0, &request, sizeof(request), MSG_WAITALL );
-- 
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